"Using software and websites, Dale records many lessons for students and makes those screencast videos available online and via the school's podcast channel."
"Engage the class using any device Socrative is a smart student response system that empowers teachers to engage their
classrooms through a series of educational exercises and games via smartphones, laptops, and tablets."
Now in Beta testing, it is free, quick and easy to set up and use but may have bugs that I didn't experience.